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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
The familiar sounds of your heart are made by the heart's valves as they open and close.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.